New Year’s Eve revellers have largely been praised for their behaviour at Australia’s biggest fireworks shows, while officers were kept busy with outbursts of trouble around local fireworks. More than a million people swarmed the main vantage points around Sydney harbour and hundreds of thousands of Melbourne partygoers were treated to a fireworks and laser spectacular. Police in both cities said the vast majority of partygoers enjoyed the night safely, although officers were kept busy with violence away from the main celebration areas. Sign up for Guardian Australia’s breaking news email A 17-year-old boy was stabbed at a park in